Facing and boring device



July 23,. 1946. P. J. CHRISTMAN 2,404,433

FACING AND BORING DEVICE Fill Led NOV. 29, 1943 I INVENTOR .PETEEJ OvR/sTMA/v z ATTORNEYJ Patented July 23, 1946 1 UNITED STATES PATENT OFF-ICE I FACING AND BORING DEVICE Peter J. Christman, Green Bay, Wis. Application November 29, 1943, Serial No. 512,146

This invention relates to improvements in facing and boring devices.

It is the primary object of theinvention to provide a boring head attachment for 'a'boring and milling machine comprising improvedmeans for feeding a tool radially independently of its rotation at any desired speed or direction.

In the past, facing attachments 'for machine tools have generally been operated intermittently by means of engagement of rotatable and ta tionary feed parts once in each'rotation of -the head for the radial advance'o'f the tool. Such devices have not been reversible in operation nor controllable as to the rate of toolfeed in the radial direction. It is an important object of the present invention to provide a construction in which the tool feed can be continuous rather than intermittent, can be controlled as to'speed;

9 Claims.

' Other objects of the invention will appear more particularly from the following disclosure thereof I I .In the drawing:

Fig. 1 is a view of my improved attachment in section,the adjacent parts of 'the boring and milling machine being also illustrated fragmentarily in section. I Fig. 2 illustrates-my improved head and contiguous portions of the boring and "milling machine in section-in a plane atright angles to the plane in which the parts areillustrated in Fig, 1. Fig. 3 is'an end elevationof the attachment. ....Fig. .4 is a. view taken insectionthrough a' .p'ortion of. the milling machine. fragmentarily illustrating .conventional parts thereof on.,a reducedjscale. r

, Like parts are identified by the same reference characters throughout the several. views.

7 The attachment comprising the present invention ispeculiarly' adapted foruse on boring and millingmachines having axially movable boring bars.particularlywhere such bars are arranged for horizontal movement. Referring first to Fig. 4, the conventional column of such a, machine is illustrated at 5. Botatablymounted in the column-is a spindle sleeve 6 of which the last gear in the conventional driving train is indicated at 1.

e spindle sleeve has a face plate at 8 to which the facing head of this invention is, attachedas will hereinafter be described. 1

.A'xially reciprocable through the spindle sleeve is 'a'splndle orfboring bar 9 splined at I0 to the sleeve for rotation therewith. For advancing the spindle or boring bar axially of the sleeve, regardless of sleeve rotation, the boring bar has a'reduced extremity at H on which a quill I2 is journaled so that the rack teeth '13 of the quill may remain in mesh with the rack feed pinion I4, nc'jt vvithstanding rotation of the spindleor bar9. l a The rack'fe'ed pinion i4 is mounted on a shaft I5 which is conventionally driven by power at a variety of speeds, but may also be driven by hand if desired. In an exemplification of a conventional boring bar machine tool, the shaft [5 may be operated'in'either direction at eight different feed speeds by a motor driven crank speed mechanism (notshown). I At its forward 'end, the spindle or boring bar 9 has a taper socket I6. r The parts adjacent the spindle sleeve faceplate are illustrated on alarger scal in Fig. 1 and Fig. 2 Forthe purposes of the present invention,

amounting plate I9; is screwed to the face plate.

as a means of supporting the facing head 20. For convenience of manufacture, the head 20.is

preferably made up in two separate: parts a, and 20b which together provide a guideway 2| for the cross slide 22 having 5 T-slot' at 23in which the -head 24 of the tool carrier 25 is adjustably f xed by nut, 26,' The tool 21 may be mounted in the carrier in any desired manner;

As shown in;Fig. 1, the'cemponent parts 20a and'2llb ofthe head 20 have registering bores lined with bushings to provide bearings for a cross shaft 28 integrally'formed to provide a pinion 25} andtowhich pinionsfiq and 3| arekeyed.

Meshing with the pinion '29 isfa rack 33 mounted on a rodwh'ich eigtends through the mounting disk [9 and is provided with a tapered end at to fitthe taper l6 of the boring bar or spindle. Any movement of the spindle inwardly or outwardly with respectto the spindle sleeve will reciprocate the rack 33 and thereby impart rotativemotion to the pinion 29.

Thepinions and 3| have twice the radius of pinion 29 and mesh with rack teeth 35 formed at the rear of the slide 22 as best shownin Fig. 2. Thus. thein and outreciprocative motion of the spindleor boring bar is communicated through rotation of the. cross shaft 28 to cause radial reciprocation ofthe slide 22 and the tool carrier and toolmounted adjustablythereon.

It will be apparent to those skilled in the art thattheradial reciprocation of the tool may be effected entirely'independently of the rotation of v the "spindlesleeve and head. The appropriate rate'of i ritation or the drive shaft I5 which actu- V tated thereby,

Ill

shaft spanning the chamber and journaled in the respective parts of said head, a set of three pinions mounted on the cross shaft within said 7 chamber, a part reciprocable axially of said head j' and including a rack meshing with the intermediate pinion, said part being adapted for connecimmaterial, it will be. noted that th component parts 29a and 2% of the head 2!] are connected together in practice by the'cross boltstl (Fig. 2) r and the head is connected to themoun-ting plate '19 by the cap screws 38 (Fig. 1 and Fig. 3). It will be notedthat in the comb'i nationefthe attachment with the machine tool, the boringbar and its driving connections perform'an entirely "new function in that'it now becomes an operator for moiiiii'gthetool laterally, wherebyftliama chinetool becoms adapte'dfor theperformanceof a facing 'rather'tfhana boring'opferati'on'; 1

reclaim? V v flliAn' attachment of the character described ce-mprisingv the combination with a centrally apertured mounting member, of a head compris inijtwo parts in connection 'With-eachotherand said mounting member, 's'aidparts havingiregis ingcavitiesproviding aninterior'chamb'enfa s' s'fshaft mounted in the head aiid spanning tion with a boring bar reciprocable in the spindle sleeve of a machine tool to which said head is att'achablfe, ine'a'nsgin the arespectivexpart's of said head providing a guidewa'y disposed transversely of the axis of head rotation, a slide reciprocably mounted in the guideway and provided with teeth exposed in the chamber of said head, the rack teeth o ftth slide meshing with the pinions at either-side of said intermediate pinion to receive transverse reciprocation upon the axial reciprocation of said part. 4. ;A tool carrying head applicable to a machine 'tool'of the type having a rotatably mounted spindle sleevexwithga ":trmi-n'al faceyiand a boringbar reciprocable axially=.o'fithegsl'eeve i-nzbear ing; ;contactjtherewith and J-provided --with driving bonnectionspbe i l'dsaid; sleeve :for actuating the said-chamberjapliirality of pinion's-o'n 'the'c'ross' shajt cor'inected for rotation, -means providing a 'giiideway"transverselymfsaidheadyas'lide pro- 7 yidedwith a tool holder moti'nte n s'aid'guid'eway for transverse reciprocat and ha ving rack teeth exposed within the chamber of said head ocrable transvers'ely with resp'ec oithe'path' ov'ementpfsaid slide --='and including arack s r nions,said las' t part including reciprocable mctienrqthmugh the 'chmerit fo'f ithe character 'fdescribed applicable'tq a centrally a'pere've" of a' machine tool to h rosaid he' adhaVinga-minterior chamber aha-ha'ransvers guideway; ofa slide reci-pmane in said gi idew'ay "transversely of the a'xis otationof said head with said spindlesleeve, slide having 'rackteeth exposed within said chamber at trans'versely'spaced po-ints therein, a i e'ss 11'1 1'Jf 'i7 spannin said-cha-mbe'rarid provided iv irs't an'd fsecond-pinions'meshing with the a "spaced 1 raok teeth efsaid slide, an intermediate pinion -oncs'aid *cross shaft *connected ior rotation withthe-pinions-lirst mentioned, and an actuating'part exposedto receive motion *th'roug'hthe aperture of the head andreciprocable in'fs aid chamber parallel to the axis of rotation of said head-and comprising-arack mes'hing with said intermediate pinion. i

'A machine toolattachment comprising :a

nd apart 4o 'ri said chamber-meshing "with another of "comprising he combination'withafceritrally mounting 'plate applicable to the spindle sleeve parts joined upona plane parallling the'projected axis of -'thefspind le sleeve'tofwhich the 7 mountmg plate is applicable, -sai dfparts" b'eing connected with each other and said {plate and being provided with registering cavities ai 'fordinga' ohamber interiorlyfl ofsa idhead, a cross 1' bar axially irrespective of I sleeve rotation said tool carrying -head j'compr isin g a body member provided withrmeans, at theend of the sleeve-apart reciprocable ax ially .Of' :the {head and projecting therefrom and provided -with-means -for connecting it ;to said boring bar to-receive axialmovementtherefrom, a transversely. movable slide rearried I b the head 'and provided'with'rack teeth, the head havinga .guideWa-y which saidslide is transversely re tact therewith and provided behindtthe sleeve 7 fand exposed-at theend 'of the bod y portion, rack 7 means within the body portion connected yvith'the slide-for tran'sv "rse reciprocation therwi fibn nieahs joaniaied m thanol-yearned 'clufding ihion' teeth mshing 1 with "the means of said slidef-a'nd a part axi'al l re'ciprocable in the "body portion and "provided with 'm'eans projecting therefrom forconnection'with with which teeth; of s'aid pinion'jmeans, whereby reciprocation fjsaid' bforing barfinf ther said boring 'bar, sa-id {part having 'rack direction -w illfcommuiiicate mttr nfth rghithe spe t a ;a i i i lft tans-tiv idslid and tool-icarrier" for the adjustment'theredf trans r-inounting, .it on ;the face I 5 versely respecting the axis of rotation of said body.

6. An attachment for a machine tool of the type comprising a spindle sleeve mounted for rotation and a boring bar reciprocable axially through said sleeve; said attachment comprising an attachment body provided with means for mounting it on the end of said sleeve, said body having a central cavity opening toward said boring bar, a part reciprocable axially in said body and provided with means adapted for connection with such a boring bar for reciprocation in both directions therewith, said part having an ofiset within the body provided With rack teeth, a pinion meshing with said rack teeth and mounted for rotation in the body cavity upon a transverse axis spanning the offset portion of said reciprocable part, a second pinion coaxial with the first and connected therewith for rotation, a slide reciprocable transversely of said body, said body having a guideway in which said slide is operatively mounted for reciprocation, rack teeth connected with the slide and meshing with the second pinion, and means for mounting a tool on the slide to be moved therewith transversel of said body upon reciprocation of said boring bar.

7. An attachment of the character described comprising the combination with a body adapted to be rotated on a predetermined axis and provided with a guideway extending transversely of said axis and opening to one end of said body, a slide reciprocable in the guideway, tool mounting means projecting from said slide and exposed at the end of the body tO which said guideway opens,

pinion means within the body, said body having a 8. The device of claim 7' in which the rack tooth means of said part is ofiset from the axis of body rotation and. said pinion means being rotatable upon a transverse axis substantially intersecting the axis of body rotation, said part having an attaching portion projecting from said body substantially on the axis of body rotation.

9. A machine tool attachment for a machine tool of the type comprising arotatably mounted sleeve, and a boring bar axially reciprocable cavity and having a transverse axis substantially intersecting the axis upon which said body portion is rotatable, a set of three pinions mounted on said cross shaft and connected for rotation in unison, the outermost of said pinions meshing with the rack teeth on the flanges of the slide, and a reciprocable part including a connecting portion adapted for connection witha .boring bar for reciprocation along the axis on which said body portion is rotatable, said part having an offset portion disposed within the cavity and provided with rack teeth" meshing with the intermediate pinion of said set of three, whereby motion may be communicated from a boring bar with i which said part is connected to said pinions and thence to said slide and tool carrier to effect transverse reciprocation thereof.

PETER J. CHRISTI/LAN. 

